How to implement automatic adding of event to google calendar from invitation generated for another user's calendar?

Question

Google

Greetings, there is such a task-problem:
Invitations come to the corporate e-mail address, which are automatically added to the local corporate calendar;
Invitations in the standard form invite.ics;
All mail, including invitations, is forwarded to the gmail box.
Forwarded invitations are not automatically added to the calendar, which, as I understand it, is due to the fact that another target calendar is specified in the invite.ice file - [email protected], and not [email protected]
I read the description of Google api, but I did not find the right solution. I really don't want to parse the file...